Increased hydrogen escape from Mars atmosphere during periods of high obliquity
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arXiv
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| Autori principali: | , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866910962714411008 |
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| author | Gilli, Gabriella González-Galindo, Francisco Chaufray, Jean-Yves Millour, Ehouarn Forget, François Montmessin, Franck Lefèvre, Franck Naar, Joseph Luo, Yangcheng Vals, Margaux Rossi, Loïc López-Valverde, Miguel Ángel Brines, Adrián |
| author_facet | Gilli, Gabriella González-Galindo, Francisco Chaufray, Jean-Yves Millour, Ehouarn Forget, François Montmessin, Franck Lefèvre, Franck Naar, Joseph Luo, Yangcheng Vals, Margaux Rossi, Loïc López-Valverde, Miguel Ángel Brines, Adrián |
| contents | It is still unknown how much water has escaped from Mars during its history. Hydrogen escape from Mars's atmosphere probably played a major role in drying the planet, but present-day Hloss rates (about 3x10^26 atoms per second on average) cannot explain the geological evidence for the large volumes of liquid water on ancient Mars. Here we used the three-dimensional Mars-Planetary Climate Model to show that H loss rates could have increased by more than one order of magnitude (6x10^27 atoms per second) during higher spin axis obliquity periods, notably in the last few million years when Mars's obliquity was about 35 deg on average. The resulting accumulated H escape over Mars's history translates into an approx. 80 m global equivalent layer, which is close to the lower limit of geological estimates, assessing the major role of atmospheric escape in drying Mars. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_16692 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Increased hydrogen escape from Mars atmosphere during periods of high obliquity Gilli, Gabriella González-Galindo, Francisco Chaufray, Jean-Yves Millour, Ehouarn Forget, François Montmessin, Franck Lefèvre, Franck Naar, Joseph Luo, Yangcheng Vals, Margaux Rossi, Loïc López-Valverde, Miguel Ángel Brines, Adrián Earth and Planetary Astrophysics Atmospheric and Oceanic Physics It is still unknown how much water has escaped from Mars during its history. Hydrogen escape from Mars's atmosphere probably played a major role in drying the planet, but present-day Hloss rates (about 3x10^26 atoms per second on average) cannot explain the geological evidence for the large volumes of liquid water on ancient Mars. Here we used the three-dimensional Mars-Planetary Climate Model to show that H loss rates could have increased by more than one order of magnitude (6x10^27 atoms per second) during higher spin axis obliquity periods, notably in the last few million years when Mars's obliquity was about 35 deg on average. The resulting accumulated H escape over Mars's history translates into an approx. 80 m global equivalent layer, which is close to the lower limit of geological estimates, assessing the major role of atmospheric escape in drying Mars. |
| title | Increased hydrogen escape from Mars atmosphere during periods of high obliquity |
| topic | Earth and Planetary Astrophysics Atmospheric and Oceanic Physics |
| url | https://arxiv.org/abs/2505.16692 |